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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f358bd80ed7470db92070419c9c5e797bdc609d119959f2a6e11e71064c0cf85' 
  AND token = '8BdmI0QAzNvB79Hx8K8+bnIwC5UgIeBzo+jAT6iojeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}